Guide member for rock drills



Nov. 12, 1935. w. A. SMITH, SR 2,020,806

GUIDE MEMBER FOR ROCK DRILLS Filed March 1, 1935 J! .1. 22 E5 51 t 55 HI INVENTOR.

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HISAT ORNEK Patented Nov. 12, 1935 UNITED STATES PATENT OFFICE GUIDEMEMBER FOR ROCK DRILLS Application March 1, 1935, Serial No. 8,809

6 Claims.

This invention relates to rock drills, and more particularly to a guidemember for rock drills of the type which are mounted slidably insupporting shells whereby they are held in correct relationship withrespect to the work.

One object of the invention is to minimize the expense of maintenance ofrock drills of this type by providing the rock drill with detachableguide ribs which may be replaced when Worn to a state ofunserviceability without necessitating the additional and comparativelygreater expense of replacing a casing part.

Another object is to equip the rock drill with a guide member that willremain secured rigidly in the assembled position on the rock drill.

Other objects will be in part obvious and in part pointed outhereinafter,

In the drawing accompanying this specification and in which similarreference numerals refer to similar parts,

Figure 1 is a longitudinal side elevation of a rock drill equipped witha guide member constructed in accordance with the practice of theinvention, I

Figures 2, 3 and 4 are transverse views taken through Figure 1 on thelines 2-2, 33 and 4-4, respectively, and

Figure 5 is a transverse view taken through Figure 3 on the line. 55.

Referring more particularly to the drawing, 20 designates the guidemember and 2| a rock drill to which the guide member is applied.

The rock drill 2|, of which only certain of the casing parts are shownfor the sake of simplicity of illustration, comprises a cylinder 22 andfront and back heads 23 and 24, respectively, which may be secured tothe cylinder by the usual side rods 25, only one of which is shown.

In accordance with the practice of the invention the cylinder 22 isprovided with a base portion or rib 26 which extends longitudinally ofthe cylinder and preferably terminates at or near the ends thereof. Thebottom of the base 26 is in the form of .a flat surface 21 which seatsupon a similar surface 28 of the guide member 20, and in the surfaces 21and 28, which are of the same width, are transverse registering slots 29and 30 containing a key 3| which serves to hold the cylinder and theguide member against relative longitudinal movement.

In the transverse view the base 26 has the appearance of a dove-tail ofwhich the side surfaces 32 incline generally in the direction of theaxis of the cylinder. The adjacent portion 33 of the plate 22 islikewise of dove-tail shape although inverted. Its side surfaces 34,therefore, decline toward the axis of the plate and preferably have thesame degree of inclination as the surfaces 32.

The surfaces 32 and 34 preferably extend along the entire length of thebase 26 and the plate 20 5 and serve as seating surfaces for clampingplates 35 arranged on opposite sides of the base 26. The clamping platesare provided with V-shaped grooves 36 to receive the portions of thebase and the plate defined by the inclined surfaces.

In order to secure the clamping plates 35 fixedly in the assembledpositions said plates and the base 26 and the portion 33 of the plate2!! are provided with registering holes 3? for the reception of securingmeans illustrated as being in the form of rivets 38. Any suitable numberof rivets may be employed for this purpose and as a preferred form ofconstruction the outer ends of the portions of the holes 31 in theplates 35 are countersunk to permit of the ends 39 of the rivets beingpeined thereinto. The holes 31 are preferably so located that theirlongitudinal axes substantially coincide with the plane of the surfaces21 and 28. Thus, semi-circular slots 40 will be located in both the base23 and the portion 33 2' and these slots register with each other toaccommodate the intermediate body portions of the rivets 38. As will bereadily understood, therefore/the rivets will be embedded equally inboth the base 26 and the portion 33 of the plate 20 to augment thelocking effect of the key 3|.

In the arrangement shown the key 3| is .arranged in the transverse planeof a rivet 38 which extends through the key. Thus, the 'clamping plateswill overlie the ends of the key slots 29 35 and 30 to retain the key 3|therein.

The plate 20 is provided on its opposite sides with guide ribs 4|adapted to extend slidably into the guideways of a rock drill shell (notshown) and which may be of a well known type commonly 40 employed forguiding and maintaining the rock drill in the correct relationship withrespect to the rock being drilled. The plate 26 is, moreover, providedat its rear end with a lug 42 to receive a feed nut 43 which is suitablythreaded internally 45 for cooperation with a feed screw (not shown) butthereby the force is applied to the rock drill for actuating itlongitudinally of its supporting shell.

In practice, the present invention has been 60 found to be highlyefiicient and to effect a considerable economy in the matter ofmaintenance of the drilling apparatus. It is a well known fact that theguide portion, such as the ribs 4| of the present structure, are exposedto severe 1. In a guide member for rock drills, the cornbination of arock drill casing and a plate having guide portions, clamp meansextending longitudinally of and on opposite sides of the casing and theplate and engaging each, and means for' securing the clamp means fixedlyto the casing and the plate.

2. In a guide member for rock drills, the combination of a rock drillcasing and a plate having guide portions, inclined surfaces on oppositesides of the casing and the plate, clamp means engaging the inclinedsurfaces, and means for securing the clamp means fixedly to the casingand the plate.

3. In a guide member for rock drills, the combination of. a rock drillcasing and a plate having guide portions, there being inclined surfaceson adjacent portions of the casing and the plate and extendinglongitudinally thereof, clamping plates engaging the inclined surfaces,and means seated in the casing and the plate'and engaging the clampingmeans for securing the clamping means fixedly to the casing and theplate.

4. In a guide member for rock drills, the combination of a rock drillcasing and a plate hav- 5 ing guide portions, there being inclinedsurfaces on adjacent portions of the casing and the plate,

clamping plates having V-shaped grooves to receive the inclinedsurfaces, and rivets embedded in the adjacent surfaces of the casing andthem plate and securing the clamping plates fixedly. to the inclinedsurfaces.

5. In a guide member for rock drills, the combination of a rock drillcasing and a plate seat- 7 ing against the casing and having guideportions, 15

clamping means extending along opposite sides of the casing and theplate for clamping the casing and the plate together, and means insertedin the confronting surfaces of the casing and the plate to preventrelative longitudinal movement 20 therebetween.

6. In a guide member for rock drills, the combination of a rock drillcasing and a plate having guide portions, a key inserted in theconfronting surfaces of the casing and the plate, clamping 25. means forclamping the casing and the plate together and for retaining the key inthe plate and the casing, and means for securing the clamping meansfixedly in position.

WILLIAM A. SMITH, SR. 7 t?

